Definition of conch noun from the Oxford Advanced Learner's Dictionary

 

conch

 noun
noun
BrE BrE//kɒntʃ//
 
; NAmE NAmE//kɑːntʃ//
 
 
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the shell of a sea creature which is also called a conch Word Origin late Middle English: from Latin concha ‘shellfish, shell’, from Greek konkhē ‘mussel, cockle, or shell-like cavity’.
See the Oxford Advanced American Dictionary entry: conch